这意味着JPEG--in-TIFF仅支持8位灰度(= 1个样本，每个像素8位)或24位彩色图像(= 3个样本(每个像素8位).

This means that JPEG--in-TIFF only supports 8-bit greyscale (= 1 sample with 8 bits per pixel) or 24-bit color images (= 3 samples with 8 bits per pixels).

TYPE_BYTE_BINARY代表黑白图片(= 1个样本，每个像素1位).您想改用TYPE_BYTE_GRAY.

TYPE_BYTE_BINARY represents a black/white picture (= 1 sample with 1 bit per pixel). You'd want to use TYPE_BYTE_GRAY instead.